You can set a default null option for all non-identifying relationships you create.
To set the default null option for a non-identifying relationship
The Model Properties dialog opens.
The Defaults tab opens.
Specifies that the foreign key within the child entity will accept nulls. This means that the child entity can exist without the existence of the parent and the relationship is optional.
Specifies that the foreign key within the child entity will not accept nulls. This means that the child entity is dependent upon the parent entity for its existence and the relationship is mandatory.
The default null option is set for all non-identifying relationships and the Model Properties dialog closes.
Note: If at any time you need to override the default null setting, you can use the Relationships editor to do this.
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